<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS3动态背景登录框代码</title>
    <link rel="stylesheet" type="text/css" href="css/styles.css">
    <style>
        .square-wrapper {
            height: 600px;
            top: 200px;
        }
        .x {
            min-height: 600px;
            margin-top: 600px;
            background: -webkit-linear-gradient(bottom left, #50a3a2 0%, #53e3a6 100%);
            background: linear-gradient(to top right, #50a3a2 0%, #53e3a6 100%); 
            opacity: 0.8;
        }
        .y { height: 100px; }
    </style>
</head>
<body>
    <div class="square-wrapper">
        <ul class="bg-bubbles">
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
    <div class="x">
        <div class="y"></div>
        <div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div><div class="y"></div>
    </div>
    <script type="text/javascript" src="js/jquery-2.1.1.min.js"></script>
</body>
</html>